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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4722f3c106942d2998025398c6947e063920ec98f4c79d09e72daee9715501d9' 
  AND token = '49/utQ8SW9kGwywaXeM0CUPJcEPgeWTF7mv9UWN5Ygw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}